用户可以选择三种金额投币，若足够金额购买饮料，则相关饮料选择变亮，售货机自动找零，管理员可以对所售饮料设置类型、名称和价格-users can choose the amount of three coin, if sufficient amount of the purchase drinks, the relevant variable-beverage choice, Automation Change vending machines, administrators can set beverages sold by category, name and price